CVE-2012-3353 in Sling JCR ContentLoader
Summary
by MITRE
The Apache Sling JCR ContentLoader 2.1.4 XmlReader used in the Sling JCR content loader module makes it possible to import arbitrary files in the content repository, including local files, causing potential information leaks. Users should upgrade to version 2.1.6 of the JCR ContentLoader
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Analysis
by VulDB Data Team • 12/20/2019
The Apache Sling JCR ContentLoader vulnerability CVE-2012-3353 represents a critical security flaw in the XML reader component that processes content imports within the Sling JCR content loader module. This vulnerability specifically affects version 2.1.4 of the JCR ContentLoader and stems from inadequate input validation mechanisms that fail to properly sanitize file paths during XML import operations. The flaw allows malicious actors to exploit the XML reader functionality to import arbitrary files from the local filesystem into the content repository, potentially exposing sensitive data and system information. The vulnerability operates by leveraging the XML parsing capabilities of the ContentLoader to traverse file system paths and retrieve files that should remain protected from unauthorized access.
The technical implementation of this vulnerability involves the XmlReader component failing to validate or sanitize file paths submitted through XML import operations, creating a path traversal condition that enables arbitrary file access. When the Sling JCR ContentLoader processes XML content containing references to local files, the XmlReader does not properly restrict the file paths to prevent access outside of intended directories. This creates a scenario where an attacker can manipulate XML import data to reference local files on the server, including configuration files, database credentials, system logs, and other sensitive information. The vulnerability is particularly dangerous because it operates at the content repository level, allowing attackers to bypass traditional file system access controls and directly inject local files into the repository structure.
The operational impact of CVE-2012-3353 extends beyond simple information disclosure to potentially enable more severe attacks within the application environment. An attacker who successfully exploits this vulnerability can gain access to sensitive system information including database connection strings, application configuration files, and other credentials that may be stored in local files. The imported files become accessible through the JCR repository, potentially allowing attackers to escalate privileges or gain deeper system access. This vulnerability can be particularly devastating in enterprise environments where Sling applications may contain sensitive corporate data, user information, or system configuration details that could be exploited for further attacks. The vulnerability also impacts the integrity of the content repository by allowing unauthorized modifications through the import of malicious content.
Security professionals should consider this vulnerability in the context of CWE-22 Path Traversal and CWE-200 Information Exposure, as it combines elements of both path traversal attacks and information disclosure. The vulnerability aligns with ATT&CK technique T1078 Valid Accounts for maintaining persistence and T1566 Phishing for credential access, as attackers may use the information gained from file imports to further compromise systems. Organizations should prioritize immediate remediation by upgrading to version 2.1.6 of the JCR ContentLoader, which includes proper input validation and path sanitization mechanisms. Additional mitigations include implementing strict file access controls, monitoring repository import operations, and conducting regular security assessments of content loading components. The vulnerability demonstrates the importance of proper input validation in content management systems and highlights the risks associated with inadequate security controls in repository-based applications.